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Showing content from https://tc39.github.io/proposal-regexp-named-groups/ below:

Named capture groups in regular expressions

Code units Unicode Characters Replacement text 0x0024, 0x0024 $$ $ 0x0024, 0x0026 $& matched 0x0024, 0x0060 $` If position is 0, the replacement is the empty String. Otherwise the replacement is the substring of str that starts at index 0 and whose last code unit is at index position - 1. 0x0024, 0x0027 $' If tailPos ≥ stringLength, the replacement is the empty String. Otherwise the replacement is the substring of str that starts at index tailPos and continues to the end of str. 0x0024, N
Where
0x0031 ≤ N ≤ 0x0039 $n where
n is one of 1 2 3 4 5 6 7 8 9 and $n is not followed by a decimal digit The nth element of captures, where n is a single digit in the range 1 to 9. If n≤m and the nth element of captures is undefined , use the empty String instead. If n>m, the result is implementation-defined. 0x0024, N, N
Where
0x0030 ≤ N ≤ 0x0039 $nn where
n is one of 0 1 2 3 4 5 6 7 8 9 The nnth element of captures, where nn is a two-digit decimal number in the range 01 to 99. If nn≤m and the nnth element of captures is undefined , use the empty String instead. If nn is 00 or nn>m, no replacement is done. 0x0024, 0x003C $<
  1. If namedCaptures is undefined , the replacement text is the String "$<".
  2. Otherwise,
    1. Scan until the next >.
    2. If none is found, the replacement text is the String "$<".
    3. Otherwise,
      1. Let the enclosed substring be groupName.
      2. Let capture be ?  Get (namedCaptures, groupName).
      3. If capture is undefined , replace the text through > with the empty string.
      4. Otherwise, replace the text through this following > with ?  ToString (capture).
0x0024 $ in any context that does not match any of the above. $

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